High-voltage power supply and high-voltage power supply circuit for X-ray tube

Abstract

The invention discloses a high-voltage power supply and a high-voltage power supply circuit for an X-ray tube. The high-voltage power supply circuit comprises a high-voltage circuit, a filament circuit, a control circuit, an over-temperature protection circuit and a global protection circuit, the high-voltage circuit is connected with the anode of the X-ray tube and is used for generating a target voltage signal; the filament circuit is connected with a filament of the X-ray tube and is used for generating filament working voltage; the over-temperature protection circuit is connected with the control circuit and is used for generating an over-temperature protection signal based on the filament temperature; the control circuit is connected with the high-voltage circuit and the filament circuit and is used for generating an enable signal based on the over-temperature protection signal or an external control signal; and the global protection circuit is connected with the control circuit, the high-voltage circuit and the filament circuit and is used for turning off the high-voltage circuit and the filament circuit based on the enable signal. By arranging the global protection circuit, the high-voltage circuit and the filament circuit can be started only after active enabling of a user, accidental starting or wrong operation is avoided, and the accident risk is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of nondestructive testing, and in particular relates to a high voltage power supply and a high voltage power supply circuit for an X-ray tube. Background Art

[0002] Traditional high-voltage power supply systems have problems such as low efficiency and insufficient stability, especially under high load and frequent start-stop conditions. Existing solutions often cannot meet the requirements of high precision, high stability and high efficiency, especially in the context of growing demand in industries such as industry, medical care and scientific research. The protection mode of high-voltage power supply is single, and when unexpected startup or erroneous operation occurs, the risk of accidents cannot be effectively avoided.

[0003] Therefore, in view of the above technical problems, it is necessary to provide a high voltage power supply and a high voltage power supply circuit for an X-ray tube. Summary of the invention

[0004] The object of the present invention is to provide a high voltage power supply and a high voltage power supply circuit for an X-ray tube, which can avoid accidental startup or erroneous operation and reduce the risk of accidents.

[0005] In order to achieve the above object, a technical solution provided by a specific embodiment of the present invention is as follows:

[0006] A high-voltage power supply circuit for an X-ray tube, the X-ray tube comprising an anode and a filament, the high-voltage power supply circuit comprising a high-voltage circuit, a filament circuit, a control circuit, an over-temperature protection circuit and a global protection circuit; wherein:

[0007] The high voltage circuit is connected to the anode of the X-ray tube and is used to generate a target voltage signal;

[0008] The filament circuit is connected to the filament of the X-ray tube and is used to generate a filament operating voltage;

[0009] The over-temperature protection circuit is connected to the control circuit and is used to generate an over-temperature protection signal based on the filament temperature;

[0010] The control circuit is connected to the high voltage circuit and the filament circuit, and is used to generate an enable signal based on an over-temperature protection signal or an external control signal;

[0011] The global protection circuit is connected to the control circuit, the high voltage circuit and the filament circuit, and is used to shut down the high voltage circuit and the filament circuit based on an enable signal.

[0012] In one or more embodiments of the present invention, the high voltage circuit includes a first oscillation module, a voltage doubling module, a tube voltage feedback acquisition module, a tube voltage regulation module and a voltage limiting protection module; wherein,

[0013] The first oscillation module is used to generate a first PWM signal;

[0014] The voltage doubling module is connected to the first oscillation module, and is used to generate a target voltage signal based on the first PWM signal, and is used to sample the target voltage signal and obtain a feedback voltage signal;

[0015] The tube voltage feedback acquisition module is connected to the voltage doubling module, and is used to generate a first voltage signal and a second voltage signal respectively based on the feedback voltage signal;

[0016] The tube voltage regulating module is connected to the tube voltage feedback acquisition module and the first oscillation module, and is used to compare the second voltage signal with the first reference voltage signal and generate a first compensation signal, and the first oscillation module adjusts the first PWM signal based on the first compensation signal;

[0017] The voltage limiting protection module is connected to the tube pressure feedback acquisition module and the tube pressure regulating module, and is used to generate a voltage limiting signal, and the tube pressure regulating module regulates the first PWM signal based on the voltage limiting signal.

[0018] In one or more embodiments of the present invention, the filament circuit includes a second oscillation module, a rectification module, a current feedback acquisition module, a filament voltage regulation module and a filament protection module; wherein,

[0019] The second oscillation module is used to generate a second PWM signal, and generate a first filament voltage based on the second PWM signal;

[0020] The rectifier module is connected to the second oscillator module and to the filament of the X-ray tube, and is used to generate a second filament voltage based on the first filament voltage;

[0021] The current feedback acquisition module is connected to the rectifier module, and is used to generate a third voltage signal and a fourth voltage signal based on the second filament voltage.

[0022] The filament voltage regulating module is connected to the current feedback acquisition module and the second oscillation module, and is used to generate a second comparison signal based on the fourth voltage signal, the second reference voltage signal and the third reference voltage signal, and the second oscillation module is used to adjust the second PWM signal based on the second comparison signal;

[0023] The filament protection module is connected to the second oscillation module, the rectifier module and the control circuit, and is used to generate a second shutdown signal based on the second filament voltage. The control circuit generates a first control signal based on the second shutdown signal, and the filament protection module shuts down the second oscillation module based on the first control signal.

[0024] In one or more embodiments of the present invention, the global protection circuit includes a first clamping unit, a second clamping unit and an enabling control unit; wherein,

[0025] The first clamping unit includes a first amplifier and a first diode, wherein the non-inverting input terminal of the first amplifier is connected to the reference potential, the inverting input terminal receives the first driving voltage or the second driving voltage, the output terminal is connected to the cathode of the first diode, and the anode of the first diode is connected to the high voltage circuit;

[0026] The second clamping unit comprises a second amplifier and a second diode, the non-inverting input terminal of the second amplifier is connected to the reference potential, the inverting input terminal receives the first driving voltage or the second driving voltage, the output terminal is connected to the cathode of the second diode, and the anode of the second diode is connected to the filament circuit;

[0027] The enable control unit is connected to the first clamp unit and the second clamp unit, and is connected to the control circuit to receive an enable signal. When the enable signal is at a first level, the enable control unit generates a first driving voltage, the first clamp unit turns off the high-voltage circuit based on the first driving voltage, and the second clamp unit turns off the filament circuit based on the first driving voltage. When the enable signal is at a second level, the enable control unit generates a second driving voltage, the first clamp unit turns on the high-voltage circuit based on the second driving voltage, and the second clamp unit turns on the filament circuit based on the second driving voltage.

[0028] In one or more embodiments of the present invention, the enabling control unit includes a first bipolar transistor and a switching diode; wherein,

[0029] The control end of the first bipolar transistor is connected to the control circuit and receives an enable signal, the first end is connected to a reference potential, and the first end is directly or indirectly short-circuited with the control end, and the second end is connected to the third end of the switch diode;

[0030] The first end of the switch diode is connected to the inverting input end of the first amplifier, the second end of the switch diode is connected to the inverting input end of the second amplifier, and the third end of the switch diode is directly or indirectly connected to the first power supply voltage.

[0031] In one or more embodiments of the present invention, the first clamping unit further includes a third diode, a cathode of the third diode is connected to the output end of the first amplifier, and an anode of the third diode is connected to the filament circuit.

[0032] In one or more embodiments of the present invention, the over-temperature protection circuit includes a first capacitor, a second capacitor, a first resistor, a second resistor, and a third resistor;

[0033] A first end of the first capacitor is connected to a reference potential, a second end is connected to a first end of a first resistor, and a second end of the first resistor is connected to a control circuit via a connector;

[0034] The first end of the second capacitor is connected to the reference potential, the second end is connected to the first end of the second resistor, the second end of the second resistor is connected to the first end of the third resistor, and the second end of the third resistor is connected to the control circuit through a connector.

[0035] Another specific embodiment of the present invention provides a technical solution as follows:

[0036] A high-voltage power supply for an X-ray tube, the high-voltage power supply comprising a housing and a high-voltage power supply circuit disposed in the housing, the X-ray tube comprising an anode and a filament, the high-voltage power supply circuit comprising a high-voltage circuit, a filament circuit, a control circuit, an over-temperature protection circuit and a global protection circuit, the high-voltage power supply further comprising a temperature sensor disposed on a surface of the housing, the temperature sensor being used to collect the filament temperature and generate a first sensing signal representing the temperature;

[0037] The high voltage circuit is connected to the anode of the X-ray tube and is used to generate a target voltage signal;

[0038] The filament circuit is connected to the filament of the X-ray tube and is used to generate a filament operating voltage;

[0039] The over-temperature protection circuit is connected to the control circuit and is used to generate an over-temperature protection signal based on the first sensing signal;

[0040] The control circuit is connected to the high voltage circuit and the filament circuit, and is used to generate an enable signal based on an over-temperature protection signal or an external control signal;

[0041] The global protection circuit is connected to the control circuit, the high voltage circuit and the filament circuit, and is used to shut down the high voltage circuit and the filament circuit based on an enable signal.

[0042] In one or more embodiments of the present invention, a USB communication interface, an RS232 communication interface and a DC power input interface are provided on one side of the housing;

[0043] The USB communication interface, RS232 communication interface and DC power input interface are connected to the control circuit.

[0044] In one or more embodiments of the present invention, the over-temperature protection circuit and part of the circuit in the high-voltage circuit are packaged on a first circuit board, and the remaining circuit of the high-voltage circuit, the filament circuit, the control circuit and the global protection circuit are packaged on a second circuit board;

[0045] The first circuit board and the second circuit board are arranged inside the shell, and silicone rubber is filled between the first circuit board, the second circuit board and the inner surface of the shell.

[0046] Compared with the prior art, the high-voltage power supply and high-voltage power supply circuit for an X-ray tube of the present invention, by setting a global protection circuit, can start the high-voltage circuit and the filament circuit only after the user actively enables, thereby avoiding accidental start-up or erroneous operation and reducing the risk of accidents;

[0047] Over-temperature protection is achieved by setting a temperature sensor and a corresponding over-temperature protection circuit;

[0048] The AC voltage output by the second transformer of the filament circuit is rectified by the rectifier module to obtain a DC voltage to power the filament, so that the light source of the X-ray tube is more stable and smooth, and the thermal fatigue of the filament is reduced. At the same time, the filament circuit is provided with a corresponding protection function to effectively extend the service life of the filament;

[0049] Silicone rubber is filled between the shell and the circuit board to form a protective layer to protect the internal electronic components and circuit boards, improve the insulation performance of the high-voltage power supply, prevent high-voltage breakdown and short circuit, and prevent external factors such as moisture and dust from damaging the power supply.

[0050] Supports multiple communication methods without manual configuration, with high transmission rate, wide compatibility and strong anti-interference ability;

[0051] By setting corresponding protection modules in the high-voltage circuit and the filament circuit, the failure rate can be reduced, the overall reliability of the system can be improved, the equipment can be ensured to operate in the best condition, and the efficiency and safety of the high-voltage power supply can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0053] Figure 1 is a schematic diagram of a high voltage power supply circuit for an X-ray tube in one embodiment of the present invention;

[0054] Figure 2 A circuit diagram of a first oscillating module of a high voltage power supply circuit for an X-ray tube in one embodiment of the present invention;

[0055] Figure 3 A schematic diagram of a second circuit board for a high voltage power supply circuit of an X-ray tube in one embodiment of the present invention;

[0056] Figure 4 is a circuit diagram of a first transformer for a high voltage power supply circuit of an X-ray tube in one embodiment of the present invention;

[0057] Figure 5 A circuit diagram of a voltage doubling unit and a sampling unit of a high voltage power supply circuit for an X-ray tube in one embodiment of the present invention;

[0058] Figure 6 A circuit diagram of a high voltage circuit portion of a high voltage power supply circuit for an X-ray tube in one embodiment of the present invention;

[0059] Figure 7 A circuit diagram of a tube voltage feedback acquisition module for a high voltage power supply circuit of an X-ray tube in one embodiment of the present invention;

[0060] Figure 8 A circuit diagram of a tube voltage regulating module for a high voltage power supply circuit of an X-ray tube in one embodiment of the present invention;

[0061] Fig. 9 A circuit diagram of a voltage limiting protection module for a high voltage power supply circuit of an X-ray tube in one embodiment of the present invention;

[0062] Fig.10 This is a circuit diagram of a second oscillation module of a high voltage power supply circuit for an X-ray tube in Embodiment 1 of the present invention;

[0063] Fig.11 This is a circuit diagram of a rectifier module for a high voltage power supply circuit of an X-ray tube in Embodiment 1 of the present invention;

[0064] Fig.12 This is a circuit diagram of a current feedback acquisition module for a high voltage power supply circuit of an X-ray tube in Embodiment 1 of the present invention;

[0065] Fig.13 This is a circuit diagram of a tube current feedback acquisition module of a high voltage power supply circuit for an X-ray tube in Embodiment 1 of the present invention;

[0066] Fig.14 This is a circuit diagram of a filament voltage regulating module of a high voltage power supply circuit for an X-ray tube in Example 1 of the present invention;

[0067] Fig.15 This is a circuit diagram of a filament protection module for a high voltage power supply circuit of an X-ray tube in Example 1 of the present invention;

[0068] Fig.16 This is a circuit diagram of a current limiting module of a high voltage power supply circuit for an X-ray tube in Embodiment 1 of the present invention;

[0069] Fig.17 is a circuit diagram of a global protection circuit for a high voltage power supply circuit of an X-ray tube in Embodiment 1 of the present invention;

[0070] Fig.18 This is a schematic diagram of a housing of a high voltage power supply for an X-ray tube in Example 2 of the present invention;

[0071] Fig.19 This is a schematic diagram of a housing of a high voltage power supply for an X-ray tube in Example 2 of the present invention;

[0072] Fig. 20 Schematic diagram of the shell of the high voltage power supply for the X-ray tube in Example 2 of the present invention. DETAILED DESCRIPTION

[0073] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0074] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0075] The term "coupled" or "connected" or "connected" in the specification includes both direct connection and indirect connection. Indirect connection is a connection through an intermediate medium, such as a connection through an electrically conductive medium, which may have parasitic inductance or parasitic capacitance; indirect connection may also include connection through other active or passive devices on the basis of achieving the same or similar functional purpose, such as connection through circuits or components such as switches and follower circuits. In addition, in the present invention, words such as "first" and "second" are mainly used to distinguish one technical feature from another technical feature, and do not necessarily require or imply that there is a certain actual relationship, quantity or order between these technical features.

[0076] In the detailed description of the specification, reference is made to the accompanying drawings forming a part thereof, wherein like reference numerals refer to like parts throughout, and wherein are shown by way of exemplary embodiments that may be implemented. It should be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present disclosure. Therefore, the following detailed description should not be considered in a limiting sense.

[0077] The various operations in the specification may be described in turn as multiple discrete actions or operations in a manner that is most helpful in understanding the claimed subject matter. However, the order of description should not be interpreted as implying that these operations must be order-dependent. Specifically, these operations may not be performed in the order presented. The described operations may be performed in an order different from the described embodiments. Various additional operations may be performed and / or the described operations may be omitted in additional embodiments.

[0078] For purposes of this disclosure, the phrase "A and / or B" means (A), (B), or (A and B). For purposes of this disclosure, the phrase "A, B and / or C" means (A), (B), (C), (A and B), (A and C), (B and C), or (A, B and C).

[0079] Various components and devices may be referred to or shown in the singular form in this document (for example, "MOS tube", "transistor", "switch", etc.), but this is only for convenience of discussion, and any element mentioned in the singular form may include multiple such elements according to the teachings of this document.

[0080] The specification describes the use of the phrases "in one embodiment" or "in other embodiments" or "in some embodiments", which may each refer to one or more of the same or different embodiments. In addition, the terms "including", "comprising", "having", etc. used in relation to the embodiments of the present disclosure are synonymous.

[0081] Embodiment 1:

[0082] like Figure 1 As shown, a high voltage power supply circuit for an X-ray tube in an embodiment of the present invention, the X-ray tube includes an anode and a filament. The high voltage power supply circuit includes a high voltage circuit 10, a filament circuit 20, a control circuit 40, an over-temperature protection circuit 30 and a global protection circuit 50.

[0083] Specifically, the high voltage circuit 10 is connected to the anode of the X-ray tube and is used to generate a target voltage signal HV_out;

[0084] The filament circuit 20 is connected to the filament of the X-ray tube and is used to generate a filament operating voltage;

[0085] The over-temperature protection circuit 30 is connected to the control circuit 40 and the temperature sensor, and is used to generate an over-temperature protection signal based on the filament temperature;

[0086] The control circuit 40 is connected to the high voltage circuit 10 and the filament circuit 20 and is used to generate an enable signal PTE9 based on an over-temperature protection signal or an external control signal. In this embodiment, the control circuit 40 includes a single chip microcomputer.

[0087] The global protection circuit 50 is connected to the control circuit 40 , the high voltage circuit 10 and the filament circuit 20 , and is used to shut down the high voltage circuit 10 and the filament circuit 20 or to start the high voltage circuit 10 and the filament circuit 20 based on the enable signal PTE9 .

[0088] The high-voltage circuit 10 in this embodiment includes a first oscillation module, a voltage doubling module, a tube voltage feedback acquisition module, a tube voltage regulating module and a voltage limiting protection module.

[0089] like Figure 2 As shown, the first oscillation module is used to generate a first PWM signal HV VCO. The first oscillation module includes a pulse modulation chip U17 and its peripheral circuits. Preferably, the model of the pulse modulation chip U17 is UC3525ADW. In this embodiment, the peripheral circuit of the pulse modulation chip U17 includes a power tube Q5 and a resistor R100. The control end of the power tube Q5 is connected to the second end of the resistor Q100. The first end of the resistor R100 is connected to the control circuit 40 to receive the signal PTE10. The second end of the power tube Q5 is indirectly connected to the RT pin 6 of the pulse modulation chip U17. The control circuit 40 controls the on and off of the power tube Q5 by generating a signal PTE10, thereby controlling the state of the pulse modulation chip U17. When the RT pin 6 of the pulse modulation chip U17 is at the first level, the pulse modulation chip U17 works and generates a first PWM signal HV VCO through the OutputA pin 11. Furthermore, the first oscillation module also includes a voltage-dividing resistor R93. The first end of the voltage-dividing resistor R93 is connected to the tube voltage regulation module ( Figure 2 The S11 shown in the figure represents the connection point with the tube voltage regulating module), and the second end is connected to the Compensation pin 9 of the pulse modulation chip U17.

[0090] Furthermore, the first oscillation module in the present embodiment also includes a surge protection unit, and the surge protection unit includes an ESD protection diode CR10 and an ESD protection diode CR11. Preferably, the models of the ESD protection diode CR10 and the ESD protection diode CR11 are SMAJ15CA-13-F. Specifically, the first end of the ESD protection diode CR10 is indirectly connected to the pin 14 of the pulse modulation chip U17, and the second end is connected to the reference potential. The first end of the ESD protection diode CR11 is indirectly connected to the pin 11 of the pulse modulation chip U17, and the second end is connected to the reference potential, wherein the first end voltage of the ESD protection diode CR11 is the first PWM signal HV VCO. It can be understood that the reference potentials involved in the present invention can all be regarded as ground potentials.

[0091] like Figure 3As shown, in this embodiment, the voltage doubling module and the over-temperature protection circuit are packaged on the same circuit board (i.e., the second circuit board). Specifically, the voltage doubling module is connected to the first oscillation module, and is used to generate a target voltage signal HV_out based on the first PWM signal HV VCO, and is used to sample the target voltage signal HV_out and obtain a feedback voltage signal KV_FDBK.

[0092] The voltage doubling module in this embodiment includes a voltage doubling unit, a sampling unit, a first power tube Q1, a second power tube Q2 and a first transformer T1. Further, in this embodiment, the voltage doubling module is connected to the first oscillation module through a control circuit 40 and a connector JB1, that is, the control circuit 40 receives the first PWM signal HV VCO generated by the first oscillation module, and transmits it to the voltage doubling module based on the connector JB1.

[0093] like Figure 4 As shown, the control end of the first power tube Q1 is connected to pin 8 of the connector JB1 and receives the first PWM signal HV VCO, and the control end is short-circuited with the first end, and the second end is connected to the first end of the primary inductor of the first transformer T1. The control end of the second power tube Q2 is connected to pin 2 of the connector JB1 and receives the first PWM signal HV VCO, and the control end is short-circuited with the first end, and the second end is connected to the second end of the primary inductor of the first transformer T1. The first PWM signal HV VCO controls the first power tube Q1 and the second power tube Q2, and the second ends of the first power tube Q1 and the second power tube Q2 output high-frequency AC signals to couple with the first transformer T1, and the secondary inductor side of the first transformer T1 outputs the primary high voltage T1_6 to the voltage doubling unit.

[0094] like Figure 5 As shown, in this embodiment, the voltage doubling unit utilizes the unidirectional conductivity of the diode and the energy storage characteristics of the capacitor. In each half cycle of the AC input voltage, the capacitor in the voltage doubling unit is alternately charged and discharged, and finally a DC voltage N times the input voltage is obtained at the output end. In this embodiment, the voltage doubling unit is a 6-stage voltage doubling circuit. The target voltage signal HV_out generated by the 6-stage voltage doubling circuit is the operating voltage of the X-ray tube, and the total voltage is about 64 times the peak value of the input voltage.

[0095] like Figure 5 As shown, the voltage doubling module in this embodiment further includes a sampling unit, which is connected to the voltage doubling unit and pin 1 (ie, JB1_1) of the connector JB1, and is used to obtain a feedback voltage signal KV_FDBK (via Figure 5 The connector JB1 outputs the feedback voltage signal KV_FDBK to the tube voltage feedback acquisition module.

[0096] like Figure 6As shown, a schematic diagram of the connection relationship between the tube voltage feedback acquisition module, the tube voltage regulation module and the voltage limiting protection module. The tube voltage feedback acquisition module is connected to the voltage doubling module, and is used to generate a first voltage signal adc_hv and a second voltage signal TP_KV_FDBK based on the feedback voltage signal KV_FDBK. The tube voltage regulation module is connected to the tube voltage feedback acquisition module and the first oscillation module, and is used to compare the second voltage signal TP_KV_FDBK and the first reference voltage signal set_hv and generate a first compensation signal, and the first oscillation module is used to adjust the first PWM signal HV VCO based on the first compensation signal. The voltage limiting protection module is connected to the tube voltage feedback acquisition module and the tube voltage regulation module, and is used to generate a voltage limiting signal, and the tube voltage regulation module adjusts the first PWM signal HV VCO based on the voltage limiting signal.

[0097] like Figure 7 As shown, the tube voltage feedback acquisition module in this embodiment includes an amplifier OP1D and its peripheral circuits, an amplifier OP1A and its peripheral circuits, and the model of the amplifier OP1D is preferably OPA4277UA.

[0098] Specifically, the inverting input terminal of the amplifier OP1D is connected to the reference potential, the non-inverting input terminal of the amplifier OP1D receives the feedback voltage signal KV_FDBK, and the output terminal of the amplifier OP1D is connected to the tube voltage regulation module and the voltage limiting protection module to generate the second voltage signal TP_KV_FDBK. The non-inverting input terminal of the amplifier OP1A is connected to the output terminal of the amplifier OP1D, the inverting input terminal of the amplifier OP1A is short-circuited with the output terminal of the amplifier OP1A, and the output terminal of the amplifier OP1A is connected to the control circuit 40 to generate the first voltage signal adc_hv. The control circuit 40 includes an analog-to-digital converter ADC, the analog-to-digital converter ADC is connected to the output terminal of the amplifier OP1A, and the analog-to-digital converter ADC is used to perform analog-to-digital conversion on the first voltage signal adc_hv, so that the control circuit 40 reads the first voltage signal adc_hv.

[0099] like Figure 8As shown, the tube voltage regulation module in this embodiment includes an amplifier OP1B and its peripheral circuits, an amplifier OP1C and its peripheral circuits. The positive input terminal of the amplifier OP1B receives the first reference voltage signal set_hv, the inverting input terminal of the amplifier OP1B is connected to the output terminal of the amplifier OP1D and receives the second voltage signal TP_KV_FDBK, and is directly or indirectly connected to the positive input terminal of the amplifier OP1C, and the output terminal of the amplifier OP1B is connected to the inverting input terminal 6 of the amplifier OP1B through the capacitor C96. The inverting input terminal of the amplifier OP1C is connected to the power supply voltage -10VAA (-10V), and the inverting input terminal of the amplifier OP1C is short-circuited with the output terminal of the amplifier OP1C. The output terminal 8 of the amplifier OP1C is directly or indirectly connected to the Compensation pin 9 of the pulse modulation chip U17 ( Figure 8 The S11 shown in FIG. 1 represents the connection with the first oscillation module).

[0100] like Fig. 9 As shown, the voltage limiting protection module includes an amplifier OP2A and its peripheral circuits, an amplifier OP2D and its peripheral circuits, and an amplifier OP2C and its peripheral circuits. The inverting input terminal of the amplifier OP2A is connected to the reference potential, the non-inverting input terminal of the amplifier OP2A is connected to the tube voltage feedback acquisition module and the tube voltage regulation module, and is used to receive the second voltage signal TP_KV_FDBK, the output terminal of the amplifier OP2A is connected to the inverting input terminal of the amplifier OP2D, the non-inverting input terminal of the amplifier OP2D is connected to the reference potential, the output terminal of the amplifier OP2D is connected to the inverting input terminal of the amplifier OP2C, the non-inverting input terminal of the amplifier OP2C is connected to the power supply voltage +10VAA (+10V), the output terminal of the amplifier OP2C is connected to the cathode of the diode CR12 in the tube voltage regulation module (i.e., S13 shown), and the anode of the diode CR12 is connected to the non-inverting input terminal of the amplifier OP1C.

[0101] It can be understood that when the second voltage signal TP_KV_FDBK is greater than the set value, the voltage limiting protection module generates a voltage limiting signal, and the diode CR12 clamps the non-inverting input terminal of the amplifier OP1C based on the voltage limiting signal, thereby adjusting the first PWM signal HV VCO to prevent the target voltage signal HV_out from exceeding the maximum operating voltage of the X-ray tube.

[0102] In this embodiment, the filament circuit 20 includes a second oscillation module, a rectification module, a current feedback acquisition module, a filament voltage regulation module, a filament protection module and a tube current feedback acquisition module.

[0103] like Fig.10As shown, the second oscillation module is used to generate a second PWM signal, and to generate a first filament voltage based on the second PWM signal. The second oscillation module includes a pulse modulation chip U20, a third power tube Q6, a fourth power tube Q7 and a second transformer T2. The OUTPUTA pin 13 and the OUTPUTB pin of the pulse modulation chip U20 are used to generate a second PWM signal, the OUTPUTA pin 13 of the pulse modulation chip U20 is connected to the control end of the fourth power tube Q7, the first end of the fourth power tube Q7 is connected to the reference potential, and the second end is connected to the first end of the primary inductor of the second transformer T2. The OUTPUTB pin 16 of the pulse modulation chip U20 is connected to the control end of the third power tube Q6, the first end of the third power tube Q6 is connected to the reference potential, and the second end is connected to the second end of the primary inductor of the second transformer T2, and the secondary inductor of the second transformer T2 generates the first filament voltage. It can be understood that the pulse modulation chip U20 generates a second PWM signal, and continuously controls the third power tube Q6 and the fourth power tube Q7 through the second PWM signal. The high-frequency AC signals output by the third power tube Q6 and the fourth power tube Q7 are coupled with the second transformer T2 to generate a first filament voltage that is not filtered.

[0104] The rectifying module is connected to the second oscillating module and to the filament of the X-ray tube, and is used for generating a second filament voltage FIL_OUT based on the first filament voltage.

[0105] like Fig.11 As shown, the rectifier module includes a rectifier diode D8, a rectifier diode D9, a first inductor L6, a capacitor C126, a capacitor C156, a capacitor C157 and a sampling resistor R150. The first end of the rectifier diode D8 is connected to the first end of the secondary inductor of the second transformer T2, and the second end is connected to the first end of the first inductor L6. The first end of the rectifier diode D9 is connected to the second end of the secondary inductor of the second transformer T2, and the second end is connected to the first end of the first inductor L6. The second end of the first inductor L6 is connected to the first end of the capacitor C126, the capacitor C156, the capacitor C157 and the sampling resistor R150 to generate a second filament voltage FIL_OUT, the capacitor C126, the capacitor C156 and the capacitor C157 are connected to the connector CN8, and the second end of the sampling resistor R150 is connected to the connector CN8. It can be understood that the rectifier module is used to filter out the high-frequency AC signal in the first filament voltage, generate a stable DC second filament voltage FIL_OUT, and output it to the filament of the X-ray tube through the connector CN8, wherein the second filament voltage FIL_OUT serves as the power supply voltage of the filament.

[0106] The current feedback acquisition module is connected to the rectification module, and is used to generate a third voltage signal adc_fil_ma and a fourth voltage signal FIL_MA based on the second filament voltage FIL_OUT.

[0107] like Fig.12 As shown, the current feedback acquisition module includes an operational amplifier chip U18 and its peripheral circuits, an operational amplifier chip U21 and its peripheral circuits, and a resistor R130. The model of the operational amplifier chip U18 is preferably INA128UA / 2K5, and the model of the operational amplifier chip U21 is preferably AD8421ARZ-R7.

[0108] The V-IN pin 2 and the V+IN pin 3 of the operational amplifier chip U18 receive the second filament voltage FIL_OUT, and the VO pin 6 generates a fourth voltage signal FIL_MA. The V-IN pin 1 and the V+IN pin 4 of the operational amplifier chip U21 are respectively connected to the V-IN pin 2 and the V+IN pin 3 of the operational amplifier chip U18, and the VOUT pin 7 of the operational amplifier chip U21 is connected to the VO pin 6 of the operational amplifier chip U18.

[0109] The first end of resistor R130 is connected to the VO pin 6 of the operational amplifier chip U18, and the second end is connected to the analog-to-digital converter ADC of the control circuit 40 to generate a third voltage signal adc_fil_ma. The analog-to-digital converter ADC is used to perform analog-to-digital conversion on the third voltage signal adc_fil_ma so that the control circuit 40 reads the third voltage signal adc_fil_ma.

[0110] like Fig.13 As shown, the tube current feedback acquisition module includes an operational amplifier chip U19 and its peripheral circuits, an amplifier OP3C and its peripheral circuits, and an amplifier OP2B and its peripheral circuits. The V+IN pin 3 of the operational amplifier chip U19 is connected to the rectifier module, the VO pin 6 of the operational amplifier chip U19 is connected to the positive phase input terminal of the amplifier OP3C, and the positive phase input terminal of the amplifier OP3C is connected to the reference potential, the inverting input terminal of the amplifier OP3C is connected to the reference potential, and is short-circuited with the output terminal of the amplifier OP3C, the output terminal of the amplifier OP3C is connected to the filament voltage regulation module, the voltage limiting protection circuit and the positive phase input terminal of the amplifier OP2B and generates a signal mA FDBK, the inverting input terminal of the amplifier OP2B is short-circuited with the output terminal, and is connected to the control circuit 40, and generates a signal adc_ma.

[0111] The filament voltage regulation module is connected to the current feedback acquisition module and the second oscillation module, and is used to generate a second comparison signal based on the fourth voltage signal FIL_MA, the second reference voltage signal set_ma and the third reference voltage signal set_ph, and the second oscillation module is used to adjust the second PWM signal based on the second comparison signal.

[0112] like Fig.14As shown, the filament voltage regulation module includes an amplifier OP3B and its peripheral circuits, an amplifier OP3D and its peripheral circuits, and an amplifier OP3A and its peripheral circuits. The inverting input terminal of the amplifier OP3B is connected to the tube current feedback acquisition module, the non-inverting input terminal of the amplifier OP3B receives the second reference voltage signal set_ma, and the second reference voltage signal set_ma is the tube current upper limit value. The output terminal of the amplifier OP3B is connected to the non-inverting input terminal of the amplifier OP3D, the inverting input terminal of the amplifier OP3D is short-circuited with the output terminal, and receives the third reference signal set_ph, wherein the third reference signal set_ph is the filament current upper limit value. The non-inverting input terminal of the amplifier OP3D is connected to the filament protection module. The output terminal of the amplifier OP3D is connected to the non-inverting input terminal of the amplifier OP3A, the inverting input terminal of the amplifier OP3A is short-circuited with its output terminal, and the output terminal of the amplifier OP3A is connected to the COMP pin 4 of the pulse modulation chip U20.

[0113] like Fig.15 As shown, the filament protection module is connected to the second oscillation module, the rectifier module and the control circuit 40, and is used to generate a second shutdown signal FIL_V based on the second filament voltage FIL_OUT. The control circuit generates a first control signal shutdown based on the second shutdown signal FIL_V, and the filament protection module shuts down the second oscillation module based on the first control signal shutdown.

[0114] The filament protection module includes an amplifier OP4B and its peripheral circuits, a diode D12 and an eighth power tube Q8. The positive input terminal and the negative input terminal of the amplifier OP4B are connected to the rectifier module, and the output terminal generates a second shutdown signal FIL_V, and the output terminal is connected to the control circuit 40. The control circuit 40 generates a first control signal shutdown based on the second shutdown signal FIL_V. The anode of the diode D12 receives the control signal shutdown, and the cathode is connected to the control terminal of the eighth power tube Q8. The first terminal of the eighth power tube Q8 is connected to the reference potential, and the second terminal is connected to the SHUTDOWN# pin 8 of the pulse modulation chip U20 in the second oscillation module. The eighth power tube Q8 is controlled to shut down to stop the second oscillation module from working. In this embodiment, the model of the diode D12 is preferably B5819WS-MS. Fig.16 As shown, the current limiting module is connected to the filament voltage regulating module to limit the upper limit value of the fourth voltage signal. The current limiting module includes an amplifier OP4A and its peripheral circuits, the non-phase input terminal of the amplifier OP4A receives the filament limit voltage set_limit, the inverting input terminal is short-circuited with the output terminal, and the inverting input terminal is connected to the filament voltage regulating module and the global protection circuit 50.

[0115] like Fig.17As shown, the global protection circuit 50 includes a first clamping unit, a second clamping unit and an enabling control unit.

[0116] The first clamping unit includes a first amplifier OP4D and its peripheral circuits, and a first diode CR33. The non-inverting input terminal 12 of the first amplifier OP4D is connected to the reference potential, the inverting input terminal 13 receives the first driving voltage or the second driving voltage, the output terminal 14 is connected to the cathode of the first diode CR33, and the anode of the first diode CR33 is connected to the high-voltage circuit 10.

[0117] The second clamping unit includes a second amplifier OP4C and its peripheral circuits, and a second diode CR29. The non-inverting input terminal 10 of the second amplifier OP4C is connected to the reference potential, the inverting input terminal 9 receives the first driving voltage or the second driving voltage, the output terminal is connected to the cathode of the second diode CR29, and the anode of the second diode CR29 is connected to the filament circuit 20.

[0118] The enable control unit is connected to the first clamp unit and the second clamp unit, and is connected to the control circuit 40 to receive the enable signal PTE9. When the enable signal PTE9 is at a first level (high level), the enable control unit generates a first driving voltage +10VAA (10V), and the first clamp unit and the second clamp unit turn off the high voltage circuit 10 and the filament circuit 20 based on the first driving voltage +10VAA (10V). When the enable signal PTE9 is at a second level (low level), the enable control unit generates a second driving voltage -10V_EN (-10V), and the first clamp unit and the second clamp unit turn on the high voltage circuit 10 and the filament circuit 20 based on the second driving voltage -10V_EN (-10V).

[0119] The enabling control unit includes a first bipolar transistor Q9 and a switching diode CR31, and corresponding peripheral circuits; wherein,

[0120] The control end of the first bipolar transistor Q9 is connected to the control circuit 40 and receives the enable signal PTE9, the first end is connected to the reference potential, and the first end is directly or indirectly connected to its control end, and the second end is connected to the third end of the switch diode CR31;

[0121] The first end of the switching diode CR31 is connected to the inverting input terminal of the first amplifier OP4C and is used to generate a first driving voltage or a second driving voltage. The second end of the switching diode CR31 is connected to the inverting input terminal of the second amplifier OP4D and is used to generate a first driving voltage or a second driving voltage. The third end of the switching diode CR31 is directly or indirectly connected to the first power supply voltage VDD (3.3V).

[0122] The first clamping unit further includes a third diode CR34 , a cathode of the third diode CR34 is connected to the output end of the first amplifier OP4D, and an anode of the third diode CR34 is connected to the filament circuit 20 .

[0123] The global protection circuit 50 utilizes the clamping effect of the diode. The high voltage circuit 10 and the filament circuit 20 can be started only after the user actively enables them, thereby avoiding the situations where the high voltage circuit 10 and the filament circuit 20 are started incorrectly and the output is abnormal. When the enable signal PTE9 is at the first level (high level), the first bipolar transistor Q9 is turned on, and the enable control unit generates a first drive voltage +10VAA (10V), that is, the inverting input terminal 13 of the second amplifier OP4D inputs a positive voltage, so the output terminal 14 of the second amplifier OP4D outputs a negative voltage. Similarly, the inverting input terminal 9 of the first amplifier OP4C inputs a negative voltage, so the output terminal 8 of the first amplifier OP4C outputs a negative voltage. Based on the clamping effect of the first diode CR33 and the second diode CR29, the anode of the first diode CR33 and the anode of the second diode CR29 are both negative voltages, and the anode of the first diode CR33 is connected to the positive input terminal of the amplifier OP1B, that is, the voltage TP_KV_PROG on the positive input terminal of the amplifier OP1B is a negative voltage, resulting in a negative output voltage of the amplifier OP1B, thereby making the high-voltage circuit 10 unable to start. The anode of the second diode CR29 is connected to the non-inverting input terminal of the amplifier OP3B. Similarly, the voltage on the non-inverting input terminal of the amplifier OP3B is a negative voltage, which causes the amplifier OP3B to output a negative voltage, thereby making the filament circuit 20 unable to start.

[0124] On the contrary, when the enable signal PTE9 is at the second level (low level), the first bipolar transistor Q9 is turned off, and the enable control unit generates a second drive voltage -10V_EN (-10V), that is, the inverting input terminal 13 of the second amplifier OP4D inputs a negative voltage, so the output terminal 14 of the second amplifier OP4D outputs a positive voltage. Similarly, the inverting input terminal 9 of the first amplifier OP4C inputs a positive voltage, so the output terminal 8 of the first amplifier OP4C outputs a positive voltage. Based on the clamping effect of the first diode CR33 and the second diode CR29, the voltage on the positive input terminal of the amplifier OP1B and the positive input terminal of the amplifier OP3B are not affected by the first diode CR33 and the second diode CR29, and the filament circuit 20 and the high-voltage circuit 10 work normally.

[0125] Furthermore, the global protection circuit 50 in this embodiment is also used to limit the tube current output when the tube current is abnormal to avoid burning the filament. When the tube current is abnormal, the positive electrode of the diode CR18 connected to the output end of the amplifier OP3B is connected to the positive input end of the amplifier OP3D and the first end of the resistor R177, the amplifier OP4A is a forward follower, the positive input end of the amplifier OP4A is connected to the filament limiting voltage set_limit (this signal limits the maximum value of the filament voltage, and the voltage value is the maximum voltage that the filament can withstand), the output end of the amplifier OP4A is connected to the second end of the resistor R177, due to the clamping effect of the diode CR18 and the third diode CR34, when the cathode voltage of the third diode CR34 is less than the filament limiting voltage set_limit, the cathode voltage of the third diode CR34 is equal to the filament limiting voltage set_limit minus the diode voltage drop, and when the cathode voltage of the third diode CR34 is greater than the filament limiting voltage set_limit, the filament voltage is effectively prevented from soaring and burning the filament.

[0126] like Figure 4 As shown, the over-temperature protection circuit 30 includes a first capacitor C10, a second capacitor C8, a first resistor R3, a second resistor R4 and a third resistor R2;

[0127] The first end of the first capacitor C10 is connected to the reference potential, the second end is connected to the first port 1 of the temperature sensor AD590LH and the first end of the first resistor R3, and the second end of the first resistor R3 is connected to the control circuit 40 through the connector JB1;

[0128] The first end of the second capacitor C8 is connected to the reference potential and the third port of the temperature sensor AD590LH, and the second end is connected to the first end of the second resistor R4. The second end of the second resistor R4 is connected to the second port 2 of the temperature sensor AD590LH and to the first end of the third resistor R2. The second end of the third resistor R2 is connected to the control circuit 40 through the connector JB1. It can be understood that the over-temperature protection circuit 30 in this embodiment is connected to the control circuit to generate an over-temperature protection signal based on the filament temperature, that is, after the filament temperature exceeds the set threshold, the over-temperature protection signal is generated, and the control circuit 40 can generate an enable signal PTE9 (high level) based on the over-temperature protection signal to stop the filament circuit and the high-voltage circuit from working.

[0129] Embodiment 2:

[0130] like Figures 18 to 20As shown, a high-voltage power supply for an X-ray tube includes a shell and a high-voltage power supply circuit arranged in the shell. The X-ray tube includes an anode and a filament. The high-voltage power supply circuit includes a high-voltage circuit, a filament circuit, a control circuit, an over-temperature protection circuit and a global protection circuit. The high-voltage power supply also includes a temperature sensor arranged on the surface of the shell. The temperature sensor is used to collect the filament temperature and generate a first sensing signal representing the temperature.

[0131] The high voltage circuit is connected to the anode of the X-ray tube to generate a target voltage signal (i.e. Fig.19 The filament circuit is connected to the filament of the X-ray tube to generate the filament operating voltage (i.e. Fig. 20 The over-temperature protection circuit is connected to the control circuit and is used to generate an over-temperature protection signal based on the first sensing signal. The control circuit is connected to the high-voltage circuit and the filament circuit and is used to generate an enable signal based on the over-temperature protection signal or the external control signal. The global protection circuit is connected to the control circuit, the high-voltage circuit and the filament circuit and is used to shut down the high-voltage circuit and the filament circuit based on the enable signal.

[0132] A USB communication interface, an RS232 communication interface and a DC power input interface are provided on one side of the housing, and the USB communication interface, the RS232 communication interface and the DC power input interface are connected to the control circuit 40. The high-voltage power supply also includes a communication circuit 70, which is connected to the control circuit 40. The communication circuit 70 includes an RS232 communication unit, a USB communication unit, an offline adjustment unit and an analog adjustment unit. The USB communication unit is used to realize USB to high-speed asynchronous serial port conversion, supporting a communication baud rate of 50bps to 6Mbps. The USB communication unit realizes the mutual conversion between the USB signal level and the UART signal level, and an ESD protection diode array is provided on the USB communication interface to prevent static electricity from damaging the serial port. The circuit uses an optocoupler chip to effectively isolate the input side from the output side, thereby protecting the device from high-voltage surges and electromagnetic interference, and preventing the current from reflux and damaging the serial port when the system fails. The RS232 communication unit is used to realize RS232 to high-speed asynchronous serial port, realize the mutual conversion between RS232 and TTL level, the transmission rate under load is 250kbps, and has strong anti-static ability, and supports communication baud rate of 250kbps.

[0133] The host computer realizes USB communication with the control circuit 40 through the USB communication interface and the USB communication unit, and realizes RS232 communication with the control circuit 40 through the RS232 communication interface and the RS232 communication unit.

[0134] Furthermore, the offline adjustment unit includes four sliding rheostats corresponding to the tube voltage, tube current, filament limiting voltage, and filament preheating voltage. Through the voltage-dividing principle of the series circuit, the resistance of the sliding rheostat is adjusted to adjust the output voltage to the control circuit 40, thereby performing offline adjustment of the tube voltage, tube current, filament limiting voltage, and filament preheating voltage.

[0135] Furthermore, the analog regulation unit inputs analog quantity to the connector through the external input, and the pins 3, 6, 5, 2 and 8 of the connector correspond to the tube voltage setting, tube current setting, tube voltage detection, tube current detection and high voltage enable respectively. Pin 3 and pin 6 are connected to pin 9 and pin 10 of the dip switch SW1 respectively. When the dip switch is disconnected, it is the analog regulation mode; when the dip switch is turned on, it is the offline regulation mode.

[0136] The over-temperature protection circuit 30 and part of the circuits in the high-voltage circuit 10 are packaged on the first circuit board, and the remaining circuits of the high-voltage circuit 10, the filament circuit 20, the control circuit 40 and the global protection circuit 50 are packaged on the second circuit board; the first circuit board and the second circuit board are set separately.

[0137] The first circuit board and the second circuit board are arranged inside the shell, and silicone rubber is filled between the first circuit board and the second circuit board and the inner surface of the shell. It is understandable that after the silicone rubber is cured, a protective layer is formed, which can protect the electronic components and circuit boards inside the shell, improve the insulation performance of the high-voltage power supply, prevent the high voltage from breaking through the air and igniting a short circuit, and prevent external factors such as moisture and dust from causing damage to the inside of the power supply. In addition, the silicone rubber has fast heat dissipation and can support the high-voltage power supply to work at full power for a long time.

[0138] The high-voltage power supply provided in this embodiment has low static power consumption. When in static state, the voltage is 24V, the current is 80mA, and the power consumption is less than 2W.

[0139] It can be seen from the above technical solutions that the present invention has the following beneficial effects:

[0140] By setting a global protection circuit, the high-voltage circuit and filament circuit can be started only after the user actively enables them, thus avoiding accidental start-up or erroneous operation and reducing the risk of accidents.

[0141] Over-temperature protection is achieved by setting a temperature sensor and a corresponding over-temperature protection circuit;

[0142] The AC voltage output by the second transformer of the filament circuit is rectified by the rectifier module to obtain a DC voltage to power the filament, so that the light source of the X-ray tube is more stable and smooth, and the thermal fatigue of the filament is reduced. At the same time, the filament circuit is provided with a corresponding protection function to effectively extend the service life of the filament;

[0143] Silicone rubber is filled between the shell and the circuit board to form a protective layer to protect the internal electronic components and circuit boards, improve the insulation performance of the high-voltage power supply, prevent high-voltage breakdown and short circuit, and prevent external factors such as moisture and dust from damaging the power supply.

[0144] Supports multiple communication methods without manual configuration, with high transmission rate, wide compatibility and strong anti-interference ability;

[0145] By setting corresponding protection modules in the high-voltage circuit and the filament circuit, the failure rate can be reduced, the overall reliability of the system can be improved, the equipment can be ensured to operate in the best condition, and the efficiency and safety of the high-voltage power supply can be improved.

[0146] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0147] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A high voltage power supply circuit for an X-ray tube, the X-ray tube comprising an anode and a filament, characterized in that: The high-voltage power supply circuit includes a high-voltage circuit, a filament circuit, a control circuit, an over-temperature protection circuit and a global protection circuit; wherein, The high voltage circuit is connected to the anode of the X-ray tube and is used to generate a target voltage signal; The filament circuit is connected to the filament of the X-ray tube and is used to generate a filament operating voltage; The over-temperature protection circuit is connected to the control circuit and is used to generate an over-temperature protection signal based on the filament temperature; The control circuit is connected to the high voltage circuit and the filament circuit, and is used to generate an enable signal based on an over-temperature protection signal or an external control signal; The global protection circuit is connected to the control circuit, the high voltage circuit and the filament circuit, and is used to shut down the high voltage circuit and the filament circuit based on an enable signal.

2. The high voltage power supply circuit for an X-ray tube according to claim 1, characterized in that: The high-voltage circuit includes a first oscillation module, a voltage doubling module, a tube voltage feedback acquisition module, a tube voltage regulation module and a voltage limiting protection module; wherein, The first oscillation module is used to generate a first PWM signal; The voltage doubling module is connected to the first oscillation module, and is used to generate a target voltage signal based on the first PWM signal, and is used to sample the target voltage signal and obtain a feedback voltage signal; The tube voltage feedback acquisition module is connected to the voltage doubling module, and is used to generate a first voltage signal and a second voltage signal respectively based on the feedback voltage signal; The tube voltage regulating module is connected to the tube voltage feedback acquisition module and the first oscillation module, and is used to compare the second voltage signal with the first reference voltage signal and generate a first compensation signal, and the first oscillation module adjusts the first PWM signal based on the first compensation signal; The voltage limiting protection module is connected to the tube pressure feedback acquisition module and the tube pressure regulating module, and is used to generate a voltage limiting signal, and the tube pressure regulating module regulates the first PWM signal based on the voltage limiting signal.

3. The high voltage power supply circuit for an X-ray tube according to claim 1, characterized in that: The filament circuit includes a second oscillation module, a rectification module, a current feedback acquisition module, a filament voltage regulation module and a filament protection module; wherein, The second oscillation module is used to generate a second PWM signal, and generate a first filament voltage based on the second PWM signal; The rectifier module is connected to the second oscillator module and to the filament of the X-ray tube, and is used to generate a second filament voltage based on the first filament voltage; The current feedback acquisition module is connected to the rectifier module, and is used to generate a third voltage signal and a fourth voltage signal based on the second filament voltage. The filament voltage regulating module is connected to the current feedback acquisition module and the second oscillation module, and is used to generate a second comparison signal based on the fourth voltage signal, the second reference voltage signal and the third reference voltage signal, and the second oscillation module is used to adjust the second PWM signal based on the second comparison signal; The filament protection module is connected to the second oscillation module, the rectifier module and the control circuit, and is used to generate a second shutdown signal based on the second filament voltage. The control circuit generates a first control signal based on the second shutdown signal, and the filament protection module shuts down the second oscillation module based on the first control signal.

4. The high voltage power supply circuit for an X-ray tube according to claim 1, characterized in that: The global protection circuit includes a first clamping unit, a second clamping unit and an enabling control unit; wherein, The first clamping unit includes a first amplifier and a first diode, wherein the non-inverting input terminal of the first amplifier is connected to the reference potential, the inverting input terminal receives the first driving voltage or the second driving voltage, the output terminal is connected to the cathode of the first diode, and the anode of the first diode is connected to the high voltage circuit; The second clamping unit comprises a second amplifier and a second diode, the non-inverting input terminal of the second amplifier is connected to the reference potential, the inverting input terminal receives the first driving voltage or the second driving voltage, the output terminal is connected to the cathode of the second diode, and the anode of the second diode is connected to the filament circuit; The enable control unit is connected to the first clamp unit and the second clamp unit, and is connected to the control circuit to receive an enable signal. When the enable signal is at a first level, the enable control unit generates a first driving voltage, the first clamp unit turns off the high-voltage circuit based on the first driving voltage, and the second clamp unit turns off the filament circuit based on the first driving voltage. When the enable signal is at a second level, the enable control unit generates a second driving voltage, the first clamp unit turns on the high-voltage circuit based on the second driving voltage, and the second clamp unit turns on the filament circuit based on the second driving voltage.

5. The high voltage power supply circuit for an X-ray tube according to claim 4, characterized in that: The enabling control unit includes a first bipolar transistor and a switching diode; wherein, The control end of the first bipolar transistor is connected to the control circuit and receives an enable signal, the first end is connected to a reference potential, and the first end is directly or indirectly short-circuited with the control end, and the second end is connected to the third end of the switch diode; The first end of the switch diode is connected to the inverting input end of the first amplifier, the second end of the switch diode is connected to the inverting input end of the second amplifier, and the third end of the switch diode is directly or indirectly connected to the first power supply voltage.

6. The high voltage power supply circuit for an X-ray tube according to claim 4, characterized in that: The first clamping unit further includes a third diode, a cathode of the third diode is connected to the output end of the first amplifier, and an anode of the third diode is connected to the filament circuit.

7. The high voltage power supply for an X-ray tube according to claim 1, characterized in that: The over-temperature protection circuit includes a first capacitor, a second capacitor, a first resistor, a second resistor and a third resistor; A first end of the first capacitor is connected to a reference potential, a second end is connected to a first end of a first resistor, and a second end of the first resistor is connected to a control circuit via a connector; The first end of the second capacitor is connected to the reference potential, the second end is connected to the first end of the second resistor, the second end of the second resistor is connected to the first end of the third resistor, and the second end of the third resistor is connected to the control circuit through a connector.

8. A high voltage power supply for an X-ray tube, characterized in that: The high-voltage power supply includes a housing and a high-voltage power supply circuit disposed in the housing, the X-ray tube includes an anode and a filament, the high-voltage power supply circuit includes a high-voltage circuit, a filament circuit, a control circuit, an over-temperature protection circuit and a global protection circuit, and the high-voltage power supply also includes a temperature sensor disposed on the surface of the housing, the temperature sensor is used to collect the filament temperature and generate a first sensor signal representing the temperature; The high voltage circuit is connected to the anode of the X-ray tube and is used to generate a target voltage signal; The filament circuit is connected to the filament of the X-ray tube and is used to generate a filament operating voltage; The over-temperature protection circuit is connected to the control circuit and is used to generate an over-temperature protection signal based on the first sensing signal; The control circuit is connected to the high voltage circuit and the filament circuit, and is used to generate an enable signal based on an over-temperature protection signal or an external control signal; The global protection circuit is connected to the control circuit, the high voltage circuit and the filament circuit, and is used to shut down the high voltage circuit and the filament circuit based on an enable signal.

9. The high voltage power supply for an X-ray tube according to claim 8, characterized in that: A USB communication interface, an RS232 communication interface and a DC power input interface are provided on one side of the housing; The USB communication interface, RS232 communication interface and DC power input interface are connected to the control circuit.

10. The high voltage power supply for an X-ray tube according to claim 8, characterized in that: The over-temperature protection circuit and part of the circuit in the high-voltage circuit are packaged on a first circuit board, and the remaining circuits of the high-voltage circuit, the filament circuit, the control circuit and the global protection circuit are packaged on a second circuit board; The first circuit board and the second circuit board are arranged inside the shell, and silicone rubber is filled between the first circuit board, the second circuit board and the inner surface of the shell.

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